Blough, G. O. (1951). Methods and activities in elementary-school science. Dryden Press.
芝加哥风格引文Blough, Glenn Orlando. Methods and Activities in Elementary-school Science. New York: Dryden Press, 1951.
MLA引文Blough, Glenn Orlando. Methods and Activities in Elementary-school Science. Dryden Press, 1951.
警告：这些引文格式不一定是100％准确.